Influence of Grain Boundaries on the Properties of Sr_(0.4)Pb_(0.6)TiO_3 Thermistors
Source abstract
Abstract
A kind of V-shaped thermistor based on Sr0.4Pb0.6TiO3 materials was fabricated by solid state reaction methods. The samples exhibit novel NTCR effect below the Curie temperature (Tc) and typical PTCR effect above Tc, the room-temperature resistivities and the values of log(ρ25℃/ρmin) increase with elevating soaking temperature. The phase structure microstructure and compositional distribution of samples were investigated by using XRD, SEM and EDS respectively. The results show that Sr, Ti concentrations near the grian boundaries are higher than that in the grains. It is estimated that the NTCR effects of (Sr, Pb)TiO3 ceramics are closely related to the Pb2+ ionic vacancies near the grain boundaries. The semiconductive mechanism of Y3+-doped (Sr,Pb)TiO3 ceramics was also discussed.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Electrical and Thermal Properties of Materials · Advanced MEMS and NEMS Technologies · Acoustic Wave Resonator Technologies
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